Hi Big Bore Hunter......welcome to TFF.
What you have is an IJ Cattleman Magnum. It was sold by Iver Johnson but manufactured in Italy by Uberti.
And, no, it's not very old. These were made from the 1970's until the mid-'80's, and while it's a nice replica of the Colt Single Action Army revolver, they're strictly shooters and have no collector value.